“…The occurrence of an abnormal brain scan in multiple sclerosis was first reported in 1954 (Seaman et al, 1954), but very few cases have appeared in the literature since then (Overton et al, 1965;Williams and Beiler, 1966;Bady et al, 1969;Gize and Mishkin et al, 1970;Moses et al, 1972;Antunes et al, 1974). In addition, positive brain scans have been reported in Schilder's disease (Valenstein et al, 1971) and progressive multifocal leucoencephalopathy (Mosher et al, 1971).…”